ABSTRACT
The aim of this study was to evaluate and compare the Scanning electron microscope [SEM] of indirect composite conditioned by Erbium-Doped Yttrium Aluminum Garnet [Er:YAG] laser, Neodymium-Doped Yttrium Aluminium Garnet [Nd:YAG] laser and Carbon Dioxide [CO[2]] laser. 18 indirect composite blocks [GC Gradia DA2, Japan] with 15 x 10 x 10 mm dimensions were made. The bonding surface of these blocks were polished, then the samples were divided into six groups as follow: Er:YAG laser with output power of 0.5 W and frequency of 10 Hz, Nd:YAG laser with output power of 0.25, 0.5 W and frequency of 10 Hz, CO[2] laser with output power of 0.5 W and frequency of 10 Hz and 5 Hz, and no treatment. Then, the surfaces were evaluated by SEM. Irregularities were observed in Er:YAG laser samples compared to control group that produced suitable retention for adhesion of cements. Nd:YAG and CO[2] lasers showed melting areas. Among different lasers, Er:YAG laser can be used as an alternative technique for surface treatment of indirect composites